Thermal Bridging & Warm-Edge Spacer Engineering in Fenestration

## Eliminating the Cold Perimeter Ring In an insulated glass unit (IGU), the spacer separates the two glass panes and holds the desiccant drying agent. For decades, window manufacturers used hollow extruded aluminum spacers. Because aluminum is an exceptional thermal conductor, it acts as a thermal highway, transferring freezing outdoor temperatures directly to the interior glass edge. ### The Consequences of Aluminum Thermal Bridging: - **Perimeter Condensation:** Water droplets form along the lower 2 inches of the sash, promoting black mold and timber frame rot. - **Desiccant Overload:** Rapid temperature cycling accelerates moisture migration past the primary seal, saturating internal molecular sieve desiccant beads. ### Modern Warm-Edge Spacer Innovations: 1. **Structural Silicone Foam (Super Spacer):** 100% polymer foam with zero conductive metal, delivering ultimate thermal resistance and flexible recovery under wind loads. 2. **Stainless Steel Thin-Wall Spacers:** Stainless steel conducts 90% less heat than aluminum while providing rigid structural strength. 3. **Composite Thermoplastic Spacers (TPS):** Extruded directly onto the glass with integrated polyisobutylene sealant. ServiceFind Windows Pro installs Energy Star v7.0 certified warm-edge glazing. Call for a **Fair Quote**.